For frosting, mix butter and cream cheese until smooth. Slowly mix in confectioner's sugar. Add vanilla extract. Frost cupcakes using a piping bag fitted with a star-shaped tip. Or frost with a small spatula. Sprinkle with colored sugar or cupcake toppers. Makes 24.

Calories Per Cupcake: 290 Carbs: 35 g Protein: 3 g Fat: 16 g

Beth Pilar, 38, and Ellen Sternau, 36, are owners of the Manhattan bakery How Sweet It Is. The friends rely on running to burn off the stress (and calories) that come with operating a bake shop. "My run is when I take stock of what needs to get done that day," says Pilar. For more, go to howsweetitispastry.com.